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单选题
Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h-pair, feed discharge and all oil fuel pressure pipingsAccording to the above sentence, which of the following statements is not true?（）
A
Both seamless mild steel and copper may be used for middle pressure steam
B
hpair means high pressure air
C
The feed piping of the boilers can be made of seamless mild steel
D
All oil pipings are made of mild steel
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更多 “单选题Seamless mild steel is used for steam (also copper for moderate pressure and temperature), h-pair, feed discharge and all oil fuel pressure pipingsAccording to the above sentence, which of the following statements is not true?（）A Both seamless mild steel and copper may be used for middle pressure steamB hpair means high pressure airC The feed piping of the boilers can be made of seamless mild steelD All oil pipings are made of mild steel” 相关考题
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Geothermal(地热)Energy
1 Since heat naturally moves from hotter regions to cooler ones, the heat from the earth's center flows outwards towards the surface. In this way, it transfers to the next layer of rock. If the temperature is high enough, some of this rock melts and forms magma(岩浆). The magma ascends in its turn towards the earth's surface. It often remains well below the earth's surface, creating vast areas of hot rock. In such regions, there are deep cracks, which allow rainwater to descend underground. Some of the heated rainwater travels back up to the earth's surface where it will appear as a hot spring. However, if this ascending hot water reaches a layer of impermeable(不可渗透的)rock, it remains trapped, forming a geothermal reservoir. If geothermal reservoirs are close enough to the surface, they can be reached by drilling wells. Hot water and steam shoot up the wells naturally, and can be used to produce electricity in geothermal power plants.
2.A few geothermal power plants depend on dry-stem reservoirs which produce steam but little or no water. In these cases, the steam is piped up directly to provide the power to spin a turbine generator. The first geothermal power plant, constructed at Lardarello in Italy, was of this type, and is still producing electricity today.
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4.A reservoir with temperatures below 300° Fahrenheit is not hot enough to flash steam but it can still be used to generate electricity in binary fluid. The steam from this is used to power the turbines. As in the flash steam plant, the geothermal water is recycled back into the reservoir.
文章(23~30)
Paragraph1_____A.Dry steam plants
B.Binary plants
C.Origin of geothermal energy
D.Generation of electricity
E.Flash steam plants
F.Recyclable water and steam
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单选题A half-height container is used（）.A
to carry cargoes of low densityB
when stowage space is limitedC
to carry cargoes such as steel products or drumsD
to double the stowage capacity of the vessel
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单选题The steam boiler is part of a closed loop steam, whereby, after the energy of the steam is used up and it becomes water again, （） is collected and returned back to the boiler for heating up again to steam.A
the formerB
the firstC
the latterD
the last
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punt used for painting over the sideB
small, reciprocating steam engineC
spool-shaped drum fitted on a winchD
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The theoretical maximum cable lengthB
The theoretical maximum bandwidthC
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permanent guide baseC
guide frameD
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rise, dropC
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goodC
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double bottom fuel oil tank temperatureB
heater supply steam flowC
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attemperator steam flow in the heater discharge circuit
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单选题A fid is a（）.A
mallet used when splicing wire ropeB
sharp pointed crow bar used to unlay wire ropeC
tapered steel pin used to separate wire ropeD
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填空题In warm and mild regions, farmed fish and shellfish are also affected by POPs because they are fed fish meal.____
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wash it with fresh water，dry and store itC
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use cleaning fluid on nylon，dacron and other synthetic lines
考题
单选题After more than one hundred years of steel production at Hallside, ______.A
the land could not be used for anything.B
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the land could then be built on.D
the land could be used for any purpose.
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单选题The main bearing shells are made of steel with a lining of bearing metal which may be white metal, copper-lead or aluminum-tin alloy What is the meaning of “which” in the sentence above?（）A
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main bearingC
steelD
bearing metal
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has high resistance at low temperaturesB
has a highly polished surfaceC
is able to pass current with little oppositionD
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east iron firingsB
mild steel fittingsC
small fittingsD
large fittings
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单选题Soot blowers should be used in proper sequence so that（）A
excess stresses will not be set up in the boilerB
the decks will not be covered with sootC
the soot will be swept toward the uptakesD
there will not be a loss of steam pressure
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a needle gunB
soap and waterC
a wire brushD
a chipping hammer
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steam rather than gas is used to turn a shaftB
vapor rather than gas is used to turn a shaftC
the former uses gas to turn a shaftD
the latter uses gas to turn a shaft
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